[MERGE] Allow plugins to select test runner class

[Robert Collins]

This is a minor refactoring of cmd_selftest to allow a plugin hooked
into the command to influence the test runner class.

The following code demonstrates a plugin to do this for subunit - 'bzr
selftest --subunit' will output a subunit test stream.

import sys

from bzrlib.commands import Command
from bzrlib.option import Option

def setup_subunit_option(cmd):
    if cmd.name() == 'selftest':
        def set_subunit_runner(option, name, new_value, parser):
            # We're active: import dependencies and setup environment
            from bzrlib.tests import TextTestRunner
            from bzrlib import osutils
            from subunit import TestProtocolClient
            class SubUnitBzrRunner(TextTestRunner):
                def run(self, test):
                    # undo bzrlib's claim for testing which looks like a test.
                    self.stream.write("success: %s\n" % (osutils.realpath(sys.argv[0]),))
                    result = TestProtocolClient(self.stream)
                    test.run(result)
                    return result
            cmd.additional_selftest_args['runner_class'] = SubUnitBzrRunner
            # Don't pass 'subunit' as an option down to cmd_selftest's run
            # method.
            del parser.values.__dict__['subunit']
        # Don't alter class variables
        cmd.takes_options = list(cmd.takes_options)
        cmd.takes_options.append(
            Option('subunit', help='Output test progress as a subunit stream.',
            custom_callback=set_subunit_runner))


Command.hooks.install_named_hook("extend_command", setup_subunit_option, "setup_subunit_option")

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